How to fix the notifications on my iPhone for the twitter app?

So I get some famous people's updates sent to my phone via SMS updates but I was playing around with the notifications and now I'm getting both the text message (which is all i wanted in the first place) AND the pop up notification (like when my phone is locked and it shows up there). I was wondering if you knew how to fix this so I can get it back to just the plain old text message, that way i don't have two notifications for the exact same thing. It gets a little crowded when i see the same thing multiple times.

There's a common situation on unofficially carrier-unlocked iPhones that causes push notifications to not work: "hacktivation" instead of official activation, which means that the iPhone can't get proper push "certificates" from Apple. Here's a bit more about activation (from a site I help maintain).

If your iPhone 3GS didn't have an original carrier SIM in it last time it was restored, and then somebody (maybe you!) ran redsn0w on it to unofficially activate it, it's been hacktivated. That's OK - it means you can use the phone - but push notifications, iMessage, and Facetime won't work, and the battery will drain a bit since the phone will keep looking for proper certificates.